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Pediatr Neurol. 2013 Dec;49(6):424-30. doi: 10.1016/j.pediatrneurol.2013.08.026. Epub 2013 Oct 15.

Automatically quantified diffuse excessive high signal intensity on MRI predicts cognitive development in preterm infants.

Author information

  • 1Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio; The Department of Pediatrics, Ohio State University College of Medicine, Columbus, Ohio; Department of Pediatrics, Division of Neonatology, University of Texas Health Science Center, Houston, Texas. Electronic address: Nehal.Parikh@nationwidechildrens.org.

Abstract

BACKGROUND:

Cognitive and language impairments constitute the majority of disabilities observed in preterm infants. It remains unclear if diffuse excessive high signal intensity on magnetic resonance imaging at term represents delayed white matter maturation or pathology.

METHODS:

We hypothesized that diffusion tensor imaging-based objectively quantified diffuse excessive high signal intensity measures at term will be strong predictors of cognitive and language development at 2 years in a cohort of 41 extremely low birth weight (≤1000 g) infants. Using an automated probabilistic atlas, mean diffusivity maps were used to objectively segment and quantify diffuse excessive high signal intensity volume and mean, axial, and radial diffusivity measures. Standardized neurodevelopment was assessed at 2 years of age using the Bayley Scales of Infant Development, third edition.

RESULTS:

Thirty-six of the 41 infants (88%) had complete developmental data at follow-up. Objectively quantified diffuse excessive high signal intensity volume correlated significantly with cognitive and language scores at 2 years (P < 0.001 for both). The sum values of the three diffusivity measures in detected diffuse excessive high signal intensity regions also correlated significantly with the Bayley scores (r(2) 34.7%; P < 0.001 for each). Infants in the highest quartile for diffuse excessive high signal intensity volumes had scores between 19 and 24 points lower than infants in the lowest quartile (P < 0.01). When diagnosed subjectively by neuroradiologists however, Bayley scores were not significantly lower in infants with extensive diffuse excessive high signal intensity.

CONCLUSIONS:

These findings lend further evidence that diffuse excessive high signal intensity is pathologic and that objectively quantified diffusion-based diffuse excessive high signal intensity volume at term is associated with cognitive and language impairments. Our approach could be used for risk stratification and early intervention for such high-risk extremely preterm infants.

Copyright © 2013 Elsevier Inc. All rights reserved.

KEYWORDS:

Bayley exam; diffuse excessive high signal intensity; diffusion tensor imaging; extremely low birth weight infant; magnetic resonance imaging; neurodevelopment; preterm; prognosis

PMID:
24138952
[PubMed - indexed for MEDLINE]
PMCID:
PMC3957176
[Available on 2014/12/1]
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